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Panasonic MGM-32262S,Panasonic MGM-32262S
差压变送器传递的模拟信号，也由多种电气信号0~10mv、0~10mA、0~20mA等输出，发展到采用国际统一标准4~20mA信号，或带HARA协议输出，进入数字式后，有多种总线协议共存的现象，在众多的现场总线协议中，由浙江中控领衔制定的EPA协议已纳入国际标准，正在推广应用，为国人赢得话语权，这是一个良好的开端，目前正在积极推广应用中，差压变送器的检测信号传输的演变如图7所示。流程工业控制操作的演变人类在同自然进行长期的艰苦斗争中，积累了丰富的经验教训，有了飞跃的发展。在手工作坊时代，人类用手工操作方法制造机器，后来进入以金属（主要是铁）为材料、用机器进行生产加工的机械化时代，这就是第一次技术革命。随后是第二次技术革命的电气时代和第三次技术革命的电子时代，现在又在酝酿新的技术革命，用一种时髦的说法就是信息时代，或知识经济社会等等。综观这三次技术革命，不难发现，由于工艺流程的改进和生产规模的扩大，仪器仪表与自动化技术的发展对流程工业的操作演变起着决定性作用。一旦了解这种总体的历史背景，就能理解，在新中国成立60年来流程工业控制操作方式的演变轨迹中，仪器仪表与自动化技术的发展同样起到不可替代的作用。60年来控制操作方式的演变如图8所示。 53MC5212B41BAF1XXXXX 53MC5000 Controllers 53MC5000 Process Control Station MicroMod
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